Set projection from user input with Arcpy

Question

This seems like to should be an easy thing to do, but I can't seem to make it work.

arcpy.env.workspace = arcpy.GetParameterAsText(0)  
output_working = arcpy.GetParameterAsText(1)  
PLSS_Intersected = arcpy.GetParameterAsText(2)  
spatial_ref = arcpy.GetParameterAsText(3)  

outCS = arcpy.SpatialReference("spatial_ref")  
outfc = os.path.join(output_working, "PLSS_Intersected")  
arcpy.Project_management(PLSS_Intersected, outfc, outCS)

EDIT:

How is the error massage that I receive. The very top is what prints out when I printed outCS.

"spatial_ref" is a string, but spatial_ref is a variable holding a string. — phloem
– phloem, Commented Dec 13, 2016 at 23:14
One issue is you are providing the string 'spatial_ref' to arcpy.SpatialReference rather than the value you have assigned to spatial_ref via arcpy.GetParameterAsText(3) — GeoSharp
– GeoSharp, Commented Dec 13, 2016 at 23:14
How do I correct this? Rather, how do I call the value instead of calling the variable holding the value? — sd1272
– sd1272, Commented Dec 13, 2016 at 23:16
outCS = arcpy.SpatialReference(spatial_ref). This uses the variable, not a string that happens to be the variable name. — GeoSharp
– GeoSharp, Commented Dec 13, 2016 at 23:19
I think it will be worth using print outCS after you get that 4th parameter as text so that you (and we) can see what a test value is that you enter. — PolyGeo
– PolyGeo ♦, Commented Dec 13, 2016 at 23:25

phloem · Accepted Answer · 2016-12-13 23:43:43Z

Although the comments have identified the immediate problem (that you are using the string literal, "spatial_ref", rather than the variable, spatial_ref), you may find it easier to change the input parameter to data type = Spatial Reference, and use the spatial reference object itself, rather than converting the spatial reference to string and back to a spatial reference object.

arcpy.env.workspace = arcpy.GetParameterAsText(0)  
output_working = arcpy.GetParameterAsText(1)  
PLSS_Intersected = arcpy.GetParameterAsText(2)  
spatial_ref = arcpy.GetParameter(3)  # get spatial reference object

outfc = os.path.join(output_working, "PLSS_Intersected")  
arcpy.Project_management(PLSS_Intersected, outfc, spatial_ref) # set spatial reference to the object

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